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On 2011-02-22T11:42:58+00:00 Ilja Sekler wrote:

Created attachment 43646
Screenshot illustrating the issue

When scrolling a sheet with merged cells, a few pixel high stripe hidden
behind the column header at scroll stops is randomly dropped or
duplicated, corrupting font display in the merged cells. This was not
the case in OpenOffice.org 3.2.1, but was introduced during the
development cycle of 3.3.0 and was imported by LibreOffice as well.

Only fonts in the merged cells are affected, not graphics. Text with
line breaks in normal, not merged cells is not affected too, because
Calc scrolls always row-wise.

STR:

1. Select a cell range spanning some cell rows, merge selected cells.

2. Activate "wrap text automatically" for the merged cells to get line
breaks.

3. Insert a (long) text and leave the cell.

4. Vertically scroll the sheet.

Actual results: randomly dropped or duplicated horizontal stripes
corrupting font display in the cell.

Both normal and page break preview are affected, forcing redraw of the
cell by resizing the window or scrolling horizontally clears the font
corruption.

Tested with

LibreOffice 3.3.1 
OOO330m19 (Build:8)
tag libreoffice-3.3.1.2

on Ubuntu 10.10 and with the current LibreOffice package shipped with
Ubuntu Natty. Downstream bug:
<https://bugs.launchpad.net/ubuntu/+source/libreoffice/+bug/720327>.

Reply at: https://bugs.launchpad.net/df-
libreoffice/+bug/720327/comments/6

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On 2011-02-22T11:46:13+00:00 Ilja Sekler wrote:

Created attachment 43647
a simple testcase

Reply at: https://bugs.launchpad.net/df-
libreoffice/+bug/720327/comments/7

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On 2011-04-13T15:55:05+00:00 Björn Michaelsen wrote:

I can confirm the issue with 3.4/recent master.

Reply at: https://bugs.launchpad.net/df-
libreoffice/+bug/720327/comments/11

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On 2011-12-22T19:07:39+00:00 Libreoffice-z wrote:

Related to "Bug 36391 - VIEWING Redraw problems"?

[Reproducible] with reporter's sample and "LibreOffice 3.4.5 RC1  - WIN7
Home Premium (64bit) German UI [Build ID: OOO340m1 (Build:501)]" with 64
bit AMD Phenom II X4 955 Processor 3.2 GHz, 4GB RAM, Graphic Card:
NVIDIA GeForce GT 430

Also with Server installation of  Master "LOdev 3.5.0beta2+  – WIN7 Home
Premium (64bit) ENGLISH UI [Build ID: 22905fb-b605e4f-4c1bcb5]"
Win-x86@6- - pull time 2011-12-20 20:59:59)

@Ilja Sekler:
<http://wiki.documentfoundation.org/BugReport_Details#Version>
Your version is?

@Kohei:
Please feel free to reassign (or reset Assignee to default) if it’s not your area or if provided information is not sufficient. Please set Status to ASSIGNED if you accept this Bug.

Reply at: https://bugs.launchpad.net/df-
libreoffice/+bug/720327/comments/12

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https://bugs.launchpad.net/bugs/720327

Title:
  [Upstream] [regression] font display corruption in merged cells
  containing line breaks in Calc when scrolling

Status in LibreOffice Productivity Suite:
  Confirmed
Status in “libreoffice” package in Ubuntu:
  New

Bug description:
  Binary package hint: openoffice.org

  Pixel rows inside merged and centered cells in Calc get randomly
  dropped or (seldom) duplicated when scrolling the sheet. This is a
  regression from openoffice.org-calc 3.2.1-7ubuntu1 res. OpenOffice.org
  3.2.1 which I see in Ubuntu's openoffice.org-calc 3.2.1-7ubuntu1.1 as
  well as in OpenOffice.org 3.3.0 from Sun/Oracle.

  Steps to reproduce:

  1. Select a cell range spanning some cell rows, merge and center the
  selected cells.

  2. Activate "wrap text automatically" for the merged cells.

  3. Insert a (long) text and leave the cell.

  4. Scroll the sheet.

  Ubuntu release: 10.10
  openoffice.org-calc 3.2.1-7ubuntu1.1

  I see this both with Metacity and with Compiz. It doesn't matter
  whether Calc runs fullscreen or in a window.

  lspci -nnk | grep -A 2 VGA
  00:02.0 VGA compatible controller [0300]: Intel Corporation N10 Family Integrated Graphics Controller [8086:a011]
  	Subsystem: ASUSTeK Computer Inc. Device [1043:83ac]
  	Kernel driver in use: i915

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